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    Question

    How many lines other than those shown in the figure are

    required to join each corner with another?
    A 56 Correct Answer Incorrect Answer
    B 48 Correct Answer Incorrect Answer
    C 20 Correct Answer Incorrect Answer
    D 32 Correct Answer Incorrect Answer

    Solution

    The number of diagonals in a polygon of n sides is given by n(n-3)/2 Hence in an octagon (number of sides = 8) is given by 8(8-3)/2=20.

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